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A soundscape for Episode 3. A full playout of the whale song that sent Pan to sleep. A watery montage of humpback, orca, bowhead and blue whales. Headphones are best. With sound design by Graham Wild and Becky Ripley.

Don\u2019t forget to take part in our Forest 404 Experiment to see how you respond to natural sounds at: bbc.co.uk/forest

#Forest404